Semiconductor lasers Feedback 14 Lasers 10 Chaos 8 Information theory 8 Chaotic systems 6 Entropy 6 Permutation entropy 6 Statistical complexity 6 Time series 6 Time-scales 6 Chaos quantifiers 4 Chaotic fluctuations 4 Distribution functions 4 High-dimensional 4 Kolmogorov-Sinai entropy 4 Laser optics 4 Low-frequency fluctuation (LFF) regime 4 Natural frequencies 4 Noise-driven excitable systems 4 Nonlinear optics 4 Numerical results 4 Optical feedback 4 Oscillations 4 Phase transitions 4 Photoacoustic effect 4 Piezoelectricity 4 Semiconductor device models 4 Time evolutions 4 Time series analysis 4